Premieres Sunday 9/8c. Watch online previews.
It's the live finale of The Biggest Loser, Season 12. Together the 15 contestants have lost nearly a ton over the course of the show. Alison has a special treat to kick off the finale, a live performance of The Biggest Loser's theme song, "Brand New Book" by Train. Alison introduces the three finalists, but they're only visible behind a scrim... for now.